Humidifier



FIG. 1 is a perspective view of a humidifier showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the drawings depict portions of the humidifier in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for a humidifier, as shown and described. 